Interpreting a Call
 
First element: Indicates the subject of the book (see schedule for explanation). One, two, or three letters. Arrange alphabetically.
C CT D DJ DJK DS
 
Second element: Indicates the subject of the book (see schedule for explanation). Whole numbers that might be followed by a decimal number. Arrange numerically.

DC
630

DC
655
DC
655.5
DC
655.55
DC
655.7
DC
693
 
Third element: Author and book numbers. Arrange alphabetically by letter and then numerically by decimal number.
DC
655.5
.M3
DC
655.5
.S4
DC
655.5
.S47
DC
655.5
.S473
DC
655.5
.S53
DC
655.5
.T3
 
Fourth element: Second author/book numbers. Arrange alphabetically by letter and then numerically by decimal number. Used only if first author/book numbers are identical.
DC
655.5
.S4
A45
DC
655.5
.S4
C23
DC
655.5
.S4
C3
DC
655.5
.S4
R5

DC
655.5
.T7
A1

DC
655.5
.T8
A1
 
Fifth element: Date. If everything else is identical for two call numbers, arrange them by date. Call numbers without dates come before call numbers with dates.
DC
655.5
.S4
R5
DC
655.5
.S4
R5
1978
DC
655.5
.S4
R5
1986
DC
655.5
.T8
DC
655.5
.T8
1923
DC
655.5
.T8
A1
 
 
Remember: Only the second element and the date are whole numbers. All others are decimal numbers (even when the decimal point is not shown).